Re: E28 M535 Automatic Transmission

[Henri Baccouche <henrib@xxxxxxxxxxxx>]

I disagree........because the torque converter on a 4HP22EH does not ever lock
up in 1 or 2 gear.

There were many modifications to these early production 4 speed
electro hydraulic auto trans. Anything less than a rebuilt revised unit
with all the updates is a waste of time.

For example:
The early solenoids clog up with particles....
The front clutch pack burn up at idle in N and P and some say even in
Reverse....
The was a modification to the trans case.....etc. etc

After the engineering  updates, the trans is very good for 200K+ miles.....
Btw, ZF still makes the 4HP22 model trans. for Land Rovers.

Henri

DASAUTO wrote:

> sounds like your lock-up servo...its computer related...and can be repaired
>
> -----Original Message-----
> From: owner-bmw@domain.elided [mailto:owner-bmw@domain.elided]On Behalf Of
> Henri Baccouche
> Sent: Sunday, January 06, 2002 5:17 PM
> To: Dany; bmw-digest@domain.elided
> Subject: Re: E28 M535 Automatic Transmission
>
> Get the ZF factory rebuilt 4HP22EH with all the updates.......
> End of problems. 1985 ZF 4HP22EH Automatics in that model had many
> engineering
> revisions.
>
> The manual trans refit requires a new driveshaft,flywheel and clutch .....
> Too much work and $$$$ or CH Fr.
>
> Henri
>
> Dany wrote:
>
> > Hi,
> >
> > I own an E28 '85 M535iA with an automatic transmission with a mileage of
> > around 100K.
> >
> > I have a problem with the transmission. When I put the shifter on 1st
> gear,
> > everytime when I cruise around 3500 rpm or more and be at a stable speed,
> the
> > second gear is engaged for one or two seconds and then comes back first
> > repeately, but if I accelerate, it doesn't do it. It only occurs when I
> > release the accelerator to be at a stable position and a stable speed. I
> have
> > changed the ATF oil and have installed at the same time new pipes on the
> > transmission coling line, they where bad, but it did'nt resolve the
> problem.
> > Do I need to replace or rebuild the transmission ?
> >
> > Is it possible to install in replacement a manual transmission ? Which
> parts
> > do I need to change for that ? Do I need to replace also something like
> the
> > computer or the chip?
> >
> > Thanks for your help.
> >
> > Dany
> >
> > M535iA '85 100Kmi
> >
> > Geneva - Switzerland
> >
> > --
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